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Full text of "The Cambridge Natural History"

88                   NEARCTIC   AND   ORIENTAL   REGIONS               CHAP.
patus, Sigmodon. On the other hand, the Sonoran genera A.ntilo~
ca,pra,t Cynomys, Procyon, and the Insectivora Marina and Scapanus,
extend further north. Peculiar to this region are only six genera
of Rodents, which seems an Insufficient reason for raising the
Sonoran province to the dignity of a region. Considered from the
point of view of numbers of peculiar forms, the Thibetan subregion
has more claims to distinction as a region ; for confined to that area
we have the genera Nectogale, -AeluTOpus, J3u$>eta-urus3 JPantholojos,
JBudorcas; while by slightly extending its limits, a number of
other peculiar forms might be added. Madagascar has distinctly
more claims to regional division. Absolutely confined to It are
eleven of the seventeen existing genera of Lemurs, the family
Centetidae among the Insectivora, which contains seven genera,
and another recently discovered and peculiar genus, Geogale; it
has six peculiar genera of Tiverridae ; it has five peculiar genera
of Hodents. In addition to this It Is negatively characterised
by the absence of the following typical African animals, ITelidae,
Proboseidea, BMnocerotidae, Equidae, Monkeys, etc. It seems
to be Impossible to avoid allowing the rank of a region to this
part of the world.
In separating the Jsfearctic from the Falaearctic region, stress
must be laid rather upon the absence of Asiatic and European forms
from North America than upon the existence in the northern half
of the jCSTew World of many peculiar forms. Peculiar to the 3Sfearctic
are the Goat genus Ifaploceros, the Jtodents J&rethizon, Zapusy and
the family Haplodontidae. The Mole genus Condylura Is also
restricted to this part of the New World. Even so it has more,
peculiar forms than the Sonoran. If we add to this the absence
of Horses, Antelopes except Antilocapra, Pigs, Hyaenas, etc., there
are strong grounds for retaining this division. It must be
agreed, however, that It comes rather nearer to the Eurasian
district than the latter does to the Oriental
The Oriental region has many characteristic animals. It has
among the Anthropoid Apes the Orangs and Gibbons; of Old World
Apes it has confined to its own area the genera Semnopithecus
and Jtfasalis. Of Lemurs there are Loris and JSIyeticelms, and
Tarsius, representing a family of that order, or even a sub-order.
The Galeopitheeidae are entirely Malayan. There are many
Bodent, Carnivorous, and Insectivorous genera; the Rhinoceroses
and, the Elephant of this region differ from those of Africa*